A-A+
A．They smile to cover embarrassment.B．It is an
问题详情
A．They smile to cover embarrassment.
B．It is an unusual and even suspicious behavior.
C．They smile to show politeness.
D．It is an expression of pleasure.
参考答案
正确答案：B
解析：信息明示题。由文章第一段中的many people in Russia consider smiling at strangers in public to be unusual and even suspicious behavior可知，B正确。
